Installing The Blade Discs - Stihl GHE 420 Manuel D'utilisation

2 To remove the wing blade and blade
disc for soft material:
● Remove the short wing blade (6) and
long wing blade (7).
● Lift off the soft material blade disc (8).
3 Remove the insert:
● Unscrew and remove the screws (9).
Lift off the insert (10).
4 To remove the blade holder and
blade disc for hard material:
● Tighten the screw (11) using the
assembly tool (1) and in doing so
detach the blade holder (12).
● Unscrew and remove the screw (11).
● Remove the blade holder (12) together
with the clamping ring (13).
● Lift off the hard material blade disc (14).
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11.4 Installing the blade discs

Risk of injury!
Always wear gloves.
Observe the specified
tightening torque of
36 - 44 Nm when tightening the
blade fastening screw, as the
secure attachment of the two blade
discs depends on this. Before
attaching the two blade discs,
check to see that they are OK and
not bent and the blades have no
notches, cracks or pieces chipped
out.
Observe the wear limits of the
blades. ( 11.9)
Both blade discs must always be
installed.
Carry out each assembly step from
1 to 5.
Clean the two blade discs and the
blade disc mounting on the
machine before installing.
Furthermore, ensure that the
feather key is inserted in the blade
shaft.
1. Insert the hard material blade disc
(Figure A)
● Insert the hard material blade disc (1)
with the three fitted blades facing
upwards.
Allow the rectangular blade
mounting (2) of the blade disc to
engage in the rectangular mounting (3)
in the bearing ring.
2. Install the blade holder with the
clamping ring (Figure A):
22
Position the notch in the clamping
ring at the corner of the blade so
that the clamping ring lies flat on
the blade disc.
● Place the clamping ring (4) onto the
blade disc (notch in the clamping ring
must enclose the blade).
● Push the blade holder (5) onto the drive
shaft (6). Make sure that the blade
holder engages in the blade disc (1)
and drops down in the clamping ring (4)
as far as possible.
3. Install the insert (Figure A):
The insert can only be installed as
shown. It cannot be inserted in any
other position.
● Install the insert (7) as shown.
● Screw in the screws (8) and tighten to
33 - 37 Nm.
4. Insert the soft material blade disc
and wing blade (Figure B):
● Insert the soft material blade disc (9)
with the four fitted blades facing
upwards.
Always insert the longer wing blade
of the two first. Then insert the
second wing blade at 90° to the first
wing blade.
● Insert the long wing blade (10). Insert
the short wing blade (11) at 90° to the
long wing blade.
5. Fasten the blade discs (Figure B):
● Attach the clamping ring (12) and
tighten together with the lock
washer (13) and the blade fastening
screw (14).
0478 201 9916 A - EN